I’m starting to think ur right… it’s normal. I realize any “turbo noise” isn’t normal but I think I’m overly sensitive with my car (I take extremely good care of it), so I knit pick any noise. If u get boost at a low RPM when the engine isn’t making much noise, I feel like you’re bound to hear something from the turbos. I’m not the most technical so feel free (anyone) to correct me. My warranty expires in December of 2029, but just to be safe, I’m going to mention it to the tech during my next oil change. I suspect they will say the same to me… they can’t find anything but they made a note.I heard this when I got mine with 29k miles. Took it in to my Infiniti dealer to have them check and the tech was able to hear it when I took him on a drive, he was even able to tell me when he heard it without me saying anything. They checked for a few days and found nothing. The turbos were replaced before I bought it and I'm still under warranty and they basically said it's noted that I brought it in just incase anything happens. I'm at 53k miles and I still hear the same very low whine when I get to a certain rpm so I really think its nothing.